Tonight's the night: When you look up at the sky Sunday evening, you will be able to see the moon at its biggest and brightest all year.

The supermoon occurs when the moon becomes full at the closest point in its orbit to Earth, called a perigee full moon. Although there has already been a supermoon this year on July 12, this one will be particularly striking. It will become full at the same time as its perigee, making it the most super of the supermoons this year. The moon is expected to appear 12% bigger and 30% brighter than it did in January 2014, when the moon was full at the farthest point in orbit (or "lunar apogee").

The moon will become full in the United States at 2:00 p.m. ET, and will light up the sky from Sunday evening to early Monday morning. The moon looks its biggest when it is at the horizon, so experts suggest checking out the supermoon around the time of moonrise to get the best view.

"The illusion occurs when the Moon is near the horizon," according to NASA. "For reasons not fully understood by astronomers or psychologists, low-hanging Moons look unnaturally large when they beam through trees, buildings and other foreground objects."

Moonrise Times:

New York City, 7:45 p.m.

Chicago, 7:43 p.m.

Los Angeles, 7:40 p.m.

Houston, 8:01 p.m.

Philadelphia, 7:49 p.m.

Phoenix, 7:40 p.m.

Indianapolis, 8:34 p.m.

Miami, 7:55 p.m.

Seattle, 8:14 p.m.

St. Louis, 7:49 p.m.

For a full list of moonrise times around the world, check out timeanddate.com.

The supermoon is a particularly exceptional astronomical event for city dwellers, as it is visible even in the most urban of areas.

“Normally, when cool stuff is happening in the night sky, we miss it because of the light pollution,” Shawn Domagal-Goldman a researcher at NASA told the Washington Post. “But there’s no such thing as too much light pollution to see the moon. All you need is nighttime and a clear sky. If you live in a city and want to share in the awe of the cosmos, this is the astronomical event for you.”

If you can't find a clear view of the supermoon tonight, you can stream it online at Space.com starting at 7:30 p.m. ET. Though tonight is the biggest supermoon of the year, another supermoon event will take place Sept. 9.

July Supermoon

Supermoon Rises

The full moon rises above the castle of Somoskoujfalu, northeast of Budapest, Hungary.

Image: Peter Kamka/Associated Press

Patriotic Moon

The perigee moon rises beyond an American flag at Kauffman Stadium (in Missouri) during a baseball game between the Kansas City Royals and the Detroit Tigers.

Image: Charlie Riedel/Associated Press

Baseball View

The supermoon peeks behind fans during a baseball game between the Los Angeles Dodgers and the San Diego Padres at Dodger Stadium.

Image: Mark J. Terrill/Associated Press

Overlooking the Gaza Strip

The perigee moon is seen behind Israelis sitting and standing on a hill at the Israeli town of Sderot, overlooking the Gaza Strip. Onlookers wait to watch "Israeli forces' bombardment and missiles fired by Palestinian militants from inside Gaza towards Israel," according to the Associated Press.

Image: Lefteris Pitarakis/Associated Press

Through Traffic

Traffic streaks by the supermoon as it rises behind the Memorial Bridge in Washington D.C.

Image: J. David Ake/Associated Press

On the Beach

A woman plays in the sand on a Cape Cod beach.

Image: Virginia Mayo/Associated Press

Mosque View

The moon overlooks a crescent of a minaret of grand Faisal mosque in Islamabad, Pakistan.

Image: Anjum Naveed/Associated Press

Sandwiched

The moon in between two buildings over the Queens borough of New York City.

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